Are there any diagrams etc showing the operation of the M&P semis
EG what each part does as the gun fires from pulling the trigger to being ready for the next round
Talk of sears springs etc may mean something to those who are really knowledgeable but without a detailed write up I can't envision what a lot of the posts are talking about

https://www.google.com/search?q=smit...ml%3B800%3B526

The trigger pushes the trigger bar (on the right side of the frame) back. The vertical portion of the trigger bar actuates the striker block, to lift it out of the way. The loop on the back end of the trigger bar engages the sear and tilts it back and down, releasing the striker assembly. Bullet exits, spent cartridge ejects and slide returns to battery, with striker held back by the sear. Ready for next trigger pull.

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-DON'T PANIC

I have the manuals D Rock mentions in this post and they are really good.

Thanks for the replies

Search Youtube for videos on detailed stripping.

Here is a video on Glocks.
https://www.youtube.com/watch?v=c1VD1D1hLsQ#t=45